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Considering non-bladder aetiologies of overactive bladder: a functional neuroimaging study.

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Overactive bladder (OAB) in women involves altered brain activity, with OAB patients showing less insula activation and more cerebellar activity during bladder filling. This suggests sensory processing differences contribute to OAB pathophysiology.

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Area of Science:

  • Neuroscience
  • Urology
  • Functional Neuroimaging

Background:

  • Overactive bladder (OAB) is a condition affecting many women, characterized by urinary urgency.
  • Understanding the neuropathophysiology of OAB is crucial for developing effective treatments.
  • Supraspinal activity modulation in response to bladder stimuli is not fully understood in OAB.

Purpose of the Study:

  • To investigate supraspinal neural activity in women with OAB during bladder distention and cold stimulation.
  • To characterize differences in brain activation patterns between women with OAB and healthy controls (HCs).
  • To explore the role of sensory processing in the pathophysiology of OAB.

Main Methods:

  • Recruited 24 female participants (12 OAB, 12 HCs).
  • Assessed lower urinary tract (LUT) and cognitive function using clinical evaluations, bladder diaries, urodynamics, and questionnaires.
  • Performed functional magnetic resonance imaging (fMRI) during bladder filling/draining with warm and cold saline.

Main Results:

  • OAB patients exhibited significant differences in bladder diary, questionnaire, and urodynamic variables compared to HCs.
  • fMRI revealed distinct brain activation patterns: OAB patients showed increased cerebellar activity during filling and decreased insula/VLPFC activity during draining.
  • Specific brain regions like the superior temporal gyrus, ventrolateral prefrontal cortex (VLPFC), and mid-cingulate cortex were activated in OAB patients during stimulation.

Conclusions:

  • Findings suggest a sensory processing and modulation deficiency in women with OAB.
  • Reduced insula activity in OAB patients may indicate impaired sensory processing.
  • Increased cerebellar activation in OAB might support compensatory pelvic-floor motor activity to prevent incontinence.